Truck mounted railroad crane boom section

Abstract

A crane boom section for a crane boom superstructure on a truck mounted railroad crane or the like is disclosed as including an enclosed exterior with spaced inner cross brace supports preventing twisting or bending of the crane boom section when subjected to heavy loads and stresses.

I claim: 
     
       1. A crane boom assembly for use with a crane boom superstructure in a railroad vehicle or the like, comprising two elongated boom sections, each boom section having an enclosed exterior wall with at least two spaced cross brace elements extending substantially normal to the elongated construction of each boom section, each cross brace element having a L-shaped cross sectional shape with each cooperating pair of cross brace elements having an X-shaped configuration, interconnecting strut means extending between the free ends of the X-shaped cross brace elements, and each of said X-shaped cross brace elements contacting the inner surface of the enclosed exterior wall through the interconnecting strut means in order to support each boom section against twisting or bending thereof along the elongated construction thereof. 
     
     
       2. The crane boom assembly as defined in claim 1 wherein the interconnecting struts of the X-shaped cross brace elements engage opposite inner side surfaces of the enclosed exterior wall. 
     
     
       3. The crane boom assembly as defined in claim 1 wherein the interconnecting struts of the X-shaped cross brace elements engage elongated reinforcing members mounted to opposite inner side surfaces of the enclosed exterior wall. 
     
     
       4. The crane boom assembly as defined in claim 1 wherein the two elongated boom sections include an inboard section and an outboard section, said inboard and outboard sections being releasably interconnected to one another at one end of each boom section. 
     
     
       5. The crane boom assembly as defined in claim 4 wherein each boom section has a rectangular cross sectional configuration defining upper, bottom and opposite side wall portions for the enclosed exterior wall, the upper and bottom wall portions of each boom section tapering toward each other from the interconnected ends of each boom section to the other ends thereof, and the opposite side wall portions of the outboard section of said crane boom assembly also tapering toward each other from the interconnected ends of each boom section to the other end thereof.